Compare and contrast.
From the Washington Post:
WASHINGTON — The government has new rules for preventing food poisoning in fresh-cut produce, but companies don’t have to follow them.
Main Entry: rule
Etymology: Middle English reule, from Anglo-French, from Latin regula straightedge, rule, from regere to keep straight, direct.
1 a : a prescribed guide for conduct or action b : the laws or regulations prescribed by the founder of a religious order for observance by its members c : an accepted procedure, custom, or habit d (1) : a usually written order or direction made by a court regulating court practice or the action of parties (2) : a legal precept or doctrine e : a regulation or bylaw governing procedure or controlling conduct
So the FDA doesn’t really have new rules, per se. More like suggestions. Helpful hints if you will. friendly advice that one gives a pal. And if you don’t follow these guidelines? Well, by gum, they’ll offer further hints, suggestions, friendly advice, and guidelines.